The free-radical theory states that aging is caused by
A. nutritional deficiencies.
B. unstable oxygen molecules in the cells that damage DNA and other cellular structures.
C. the body's lowered resistance to stress and disease.
D. biological constraints on cell division.
Answer: B
You might also like to view...
Laboratory experiments are associated with higher ______ validity than field experiments, whereas field experiments are associated with higher ______ validity than laboratory experiments.
What will be an ideal response?
Last week Ted saw a movie that vividly depicted a serial killer's gruesome murders. When school began this week, Ted had an uncomfortable feeling when one of his teachers walked into class
After class, Ted realized that the teacher had a striking resemblance to the killer. Ted's reaction to the teacher is an example of a) extinction. b) acquisition. c) discrimination. d) generalization.
Which of the following conclusions can we draw from research on stalking?
a. more men than women have been the target of stalking behavior b. men and women are at equal risk for stalking victimization c. most stalkers have major personality disorders d. sizeable numbers of targets are acquainted with their stalkers
Which situation best illustrates reciprocal teaching?
A. Ella, a talented math student, works on a multiplication worksheet with Caleb, a struggling student. B. Katianna presents a geography project first to her own third-grade class and then to a second-grade class. C. Nicco, Tyler, and their teacher read a passage on ecosystems and take turns leading dialogues on it. D. Angela, a gifted student, visits a resource room where Ms. Dailey shows her computer programming techniques.